1 files changed, 65 insertions, 0 deletions
diff --git a/vendor/github.com/zenazn/goji/web/middleware/subrouter.go b/vendor/github.com/zenazn/goji/web/middleware/subrouter.go
new file mode 100644
index 0000000..e5b0921
--- /dev/null
+++ b/vendor/github.com/zenazn/goji/web/middleware/subrouter.go
@@ -0,0 +1,65 @@
+package middleware
+
+import (
+	"net/http"
+
+	"github.com/zenazn/goji/web"
+)
+
+type subrouter struct {
+	c *web.C
+	h http.Handler
+}
+
+func (s subrouter) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if s.c.URLParams != nil {
+		path, ok := s.c.URLParams["*"]
+		if !ok {
+			path, ok = s.c.URLParams["_"]
+		}
+		if ok {
+			oldpath := r.URL.Path
+			oldmatch := web.GetMatch(*s.c)
+			r.URL.Path = path
+			if oldmatch.Handler != nil {
+				delete(s.c.Env, web.MatchKey)
+			}
+
+			defer func() {
+				r.URL.Path = oldpath
+
+				if s.c.Env == nil {
+					return
+				}
+				if oldmatch.Handler != nil {
+					s.c.Env[web.MatchKey] = oldmatch
+				} else {
+					delete(s.c.Env, web.MatchKey)
+				}
+			}()
+		}
+	}
+	s.h.ServeHTTP(w, r)
+}
+
+/*
+SubRouter is a helper middleware that makes writing sub-routers easier.
+
+If you register a sub-router under a key like "/admin/*", Goji's router will
+automatically set c.URLParams["*"] to the unmatched path suffix. This middleware
+will help you set the request URL's Path to this unmatched suffix, allowing you
+to write sub-routers with no knowledge of what routes the parent router matches.
+
+Since Go's regular expressions do not allow you to create a capturing group
+named "*", SubRouter also accepts the string "_". For instance, to duplicate the
+semantics of the string pattern "/foo/*", you might use the regular expression
+"^/foo(?P<_>/.*)$".
+
+This middleware is Match-aware: it will un-set any explicit routing information
+contained in the Goji context in order to prevent routing loops when using
+explicit routing with sub-routers. See the documentation for Mux.Router for
+more.
+*/
+func SubRouter(c *web.C, h http.Handler) http.Handler {
+	return subrouter{c, h}
+}